Thanks for the answers! I didn't mean to imply I live in the desert, I'm
in NY State. It gets hot and muggy here in the summer. I don't think
that the sun in the winter does much to heat up the house because
the sunshine is so weak & mostly cloudy days. My house is pretty dark on the
outside - roof and exterior walls are dark - I've been wondering how much
the dark walls contribute to baking me in the summer :) Steaming,
On a 90 F day, 1 ft^2 of R20 light-colored wall outside 80 F air would gain
(90-80)1ft^2/R20 = 0.5 Btu/h. A dark wall in full sun might have 250 Btu/h
= 0.1741x10^-8((T+460)^4-(90+460)^4), so T = 236 F, and (236-80)/1ft^2/R20
= 7.8 Btu/h, eg (7.8-0.5)8x40 = 2340 Btu/h more for an 8'x40' wall.
They should, but some "planned communities" in Arizona specify _maximum_
reflectivities for walls and roofs, based on aesthetics... :-)
Generally speaking, yes. The more "heat" you can reflect from
the surface of the house, the less is absorbed into the structure
which heats the inside.
A reflective metal roof will do wonders, also.
But bear in mind that the opposite occurs in the winter, when
it would be nice to absorb all the heat from the sun and the
surrounding that you can. I understand that the desert gets
really cold in winter, and you generally have to use more
energy to heat up something than to cool it off a few degrees, since
there is a mechanical advantage in BTUs of cooling, but you
usually have to burn something to heat.......
So, whether or not a really reflective dwelling is a good idea
depends pretty much on where you are located and the summer/winter
If you were to "re-paint" and "re-roof" twice a year, it might
work pretty good, but I haven't heard of anyone actually using
this fantastic idea of mine.... :>)))))
If you shade your house with trees, you can accomplish the same
thing, and the neighbors won't mind...... Oops, I mean shade your
house with cactusseses.... :>))))
Often done in some parts of the country. Of course in the desert they can't
grow a big oak tree. East and South sides of the house have trees that will
lose leaves in the winter but give shade in the summer. Evergreens are
planted on the other sides to block the prevailing winds.
Yes and yes, but don't expect too much.
There is a larger effect for those living in a desert type area, and
remember if you live in an area that requires heating a good part of the
year, the reverse is also true.
I would look especially to the roof color. While a properly vented roof
will reduce the direct heat gain to the house a light roof will help keep
the roof itself cooler and help it last longer.
I suggest you want an overhang on the south side of your house with
In the summer, when the sun is high in the sky, the overhang will shade
the windows. In the winter, the sun is lower in the sky and the sun
can shine through the windows.
You want to shade the east and west sides in the summer.
find out about evap coolers and window shade screens
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